Angi's current national range across tank sizes and system types.
Check sourceUS septic planning calculator
Septic Tank Cost Calculator: Installation & Replacement
Estimate septic installation, tank replacement and drain-field costs by project, home size, system, soil and access. Free planning range with no signup.
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Estimate your septic project
Choose the job and the conditions that most often change excavation, treatment and drain-field scope.
Septic Tank Cost · septictankcost.com
Planning cost range
$3,000–$8,000Midpoint: $5,5002026 project and system evidence band$3,000–$8,000
Capacity, soil and access factor1.00×
- Evidence reviewed 14 September 2026; source links and observed ranges are listed in the methodology.
- A soil evaluation, design and local permit can change both the allowed system and final price.
- The result is a planning range, not a contractor bid or an approval decision.
Evidence reviewed 14 September 2026
The current ranges behind the calculator
These are source observations used to bound a national planning model. They are not additive line items, a local price list or a prediction for a particular property.
Angi's separate 2026 installation observations for these materially different system types.
Check sourceAngi's current alternative-system installation observations.
Check sourceAngi's current replacement range when the tank itself fails.
Check sourceHomeGuide's national range; mound fields are listed separately at $10,000–$20,000.
Check sourceHomeGuide's combined replacement/installation range.
Check sourceAngi's current range, with an average around $1,300.
Check sourceHomeGuide's current pump-out range used as the maintenance baseline.
Check sourceSacramento County's 2026–27 tank-replacement through alternative-system installation fees; soil study is $1,549 separately. This is an example, not a national range.
Check sourceTransparent method
What the estimate does—and does not—calculate
The model starts with separately sourced 2026 bands for installation, tank-only, drain-field, full-system and pumping work. System type is built into the applicable project band; smaller visible adjustments then show how capacity, soil and access can move a project. It rounds the output to planning figures and never selects a legally suitable system.
Read the model and sourcesPlan the full scope
Cost and decision guides
Each page owns one search intent and leads back to the same transparent estimator.
Browse the complete guide library01 · New system cost
Septic system installation cost
Plan a new septic system budget across design, permits, excavation, tank, treatment and drain field.
Read guide02 · Tank projectSeptic tank replacement cost
Understand tank replacement scope, excavation, connections, disposal and possible system-wide repairs.
Read guide03 · Absorption areaDrain field replacement cost
Plan leach-field investigation, design, excavation, distribution and restoration without assuming the tank also needs replacing.
Read guide04 · MaintenanceSeptic tank pumping cost
Estimate pumping and service scope by tank size, access, travel and add-on inspection work.
Read guide05 · Site evidencePerc test and septic soil evaluation cost
Understand the test, professional work and local review that inform a septic design.
Read guide06 · System comparisonSeptic system types and costs
Compare conventional, chamber, aerobic and mound systems without treating price as a suitability decision.
Read guide07 · Repair diagnosisSeptic System Repair Cost: 2026 Price Guide
Compare common septic repair costs, diagnostic scope and the point at which a component repair becomes a larger replacement project.
Read guide08 · Alternative designEngineered Septic System Cost by Type
Compare aerobic, mound, chamber, drip and sand-filter installation costs without treating the cheapest system as a valid design choice.
Read guide09 · Inspection scopeSeptic Inspection Cost: 2026 Price and Checklist
Understand routine, detailed and real-estate septic inspection cost, access charges and what a useful report should cover.
Read guide10 · Local feesSeptic Permit Cost: Current 2026 Fee Examples
See current official permit examples and learn why one national septic-permit average cannot represent different local approval packages.
Read guide11 · Paying for replacementSeptic Replacement Financing and Assistance
Check current federal, state and local assistance routes before comparing private financing for septic repair or replacement.
Read guide12 · Buyer due diligenceBuying a House With a Septic System: Cost Checklist
Use records, a dedicated inspection and an evidence-based repair allowance before committing to a home served by septic.
Read guide13 · Tank capacitySeptic Tank Cost by Size: 750 to 1,750 Gallons
Compare current tank-only price observations by gallon size, then separate equipment from excavation, connections, permits and the drain field.
Read guide14 · Advanced treatmentAerobic Septic System Cost: Installation and Ownership
Price an aerobic treatment unit as a complete permitted system, including treatment, dispersal, electrical work and required service.
Read guide15 · Raised treatment systemMound Septic System Cost: Installation and Ongoing Scope
Plan a mound-system budget across design, sand fill, pumping, pressure distribution, electrical work and long-term maintenance.
Read guide16 · Advanced treatmentSand Filter Septic System Cost: Design, Installation and Maintenance
Plan a recirculating sand-filter septic project without treating an advanced treatment system as a conventional tank-and-field replacement.
Read guideEvidence register
Sources stay attached to the model.
- US EPA septic-system questionsLocal permitting, soil assessment, system selection and professional-finding context; reviewed 14 September 2026.
- Angi septic installation cost data2026 national installation, system-type, testing, permit and component ranges; reviewed 14 September 2026.
- Angi septic repair cost data2026 tank-replacement and repair-component ranges; reviewed 14 September 2026.
- HomeGuide drain-field replacement data2026 drain-field, tank-and-field and pumping ranges; reviewed 14 September 2026.
- Angi perc-test cost data2026 professional soil-testing range and scope; reviewed 14 September 2026.
- Sacramento County liquid-waste feesA current local example showing why permit, soil-study and review fees cannot be represented by one national allowance; reviewed 14 September 2026.